Mining apparatus



Dec. 1, 1936. c. F. osGooD MINING APPARATUS Filed Nov.l 2o, 1933 4 Sheets-Sheet Dec. 1, 1936.

c. F. osGOoD 'MINING APPARATUS l Filed Nov. 20, 1953 4 Shets-Sheelt 2 fig. 3.

in@ ull 20)@ Q@ Q@ "Q@ zvezzar.

5 9Min/www wir@ Dec. l, 1936. c.- F. ose-OQO y 2,062,659

MINING APPARATUS 'Filed Nov. 20. 1933 4 Sheets-Sheet 3 'DEG 1, Q F. OSGQOD MINING APPARATUS Filed Nov. 20, 1933 v 4 Sheets-Sheet 4 y Eig. y.. MJ m 115 115 73 11 d 1X6 72 l "10V u f l 10 y fz'zunym 10 123 101 V Il a vz y 115 nll'llllllii m R115 105 l l A Y Zzverzarq y/arZeJj/T'qgoadl.

dan@

Patented Dec. 1, 1936 UNITED STATES MINING APPARATUS Charles F. Osgood, Claremont, I-., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application November 20, 1933, Serial No. 698,797

49 Claims.

This invention relates to mining apparatus, and more particularly to improvements in coal mining apparatus of the combined horizontal and shear cutter, track supported and guided type.

An object of this invention is to provide an improved coal mining apparatus. Another object is to provide an improved coal mining apparatus of the combined horizontal andv shear cutter type. A further object is toprovide an improved coal mining apparatus of the combined horizontal and shear cutter, track supported and guided type, adapted to eiect its cutting functions while supported by a mine track-way. A still further object is to provide an improved adjustable supporting structure for the kerf cutting mechanism of such an apparatus. Yet another object is to provide an improved adjustable supporting structure for the kerf cutting mechanism whereby the kerf cutter may be psitioned to cut kerfs in the coal face in any desired horizontal plane between the mine roof and mine floor and to cut vertical kerfs at any location between the ribs of the entry. A further object is to provide, in such an apparatus, im- 25 proved adjustable kerf cutting mechanism operative to cut kerfs in the coal face in parallel planes either horizontally or vertically and in intersecting planes. Yet another object is to provide an improved adjustable kerf cutting mechanism whereby kerfs may be cut at or near the level of the mine oor outside and below the level of the mine trackway, in any desired horizontal plane between the mine roof and the mine iioor and in vertical planes between the ribs of the entry. Another object is to provide an improved coal mining apparatus of a truly universal character having an extremely wide range of adjustment of the kerf cutting mechanism whereby keris may be cut in the mine wall at practically any desired location. These and other objects of the invention will, however, hereinafter more fully appear.

In the accompanying drawings there is shown, for purposes of illustration, one form which the invention may assume in practice.

In these drawings,

Fig. 1 is a plan view of the illustrative embodiment of the improved mining apparatus.

Fig. 2 is a side elevational view of the mining apparatus shown in Fig. 1.

Fig. 3 is a horizontal sectional View taken substantially on line 3 3 of Fig. 2, with parts shown in plan.

Fig. 4 is a vertical sectional view taken sub- 55 stantially on line `Il l of Fig. 3.

Fig. 5 is a transverse vertical sectional view taken on line 5 5 of Fig. 3.

Fig. 6 is a longitudinally extending vertical. sectional view taken substantially on line 6 6 of Fig. 1. l

Fig. 7 nis a horizontal sectional View taken substantially on line 1 1 of Fig. 6.`

Fig. 8 is a horizontal sectional view taken substantially on` line 8 8 of Fig. 6.

Fig. 9 is a horizontal sectional view taken substantially on line 9 9 of Figs. '7l and 10.

Fig. 10 is av horizontal sectional View taken substantially on line III IIIA of Fig. 9. v

In this illustrative embodiment of the invention, thereis shown Va coal mining apparatus of the combined horizontal and shear cutter, track supported and guided type, adapted to operate from a mine traokway, and generally comprising a'self-propelled portable base, herein in the form of a truck frame Ifmounted on wheels 2 adapted to run along a mine trackway 3. Supported on the truck frame I for rotative movement relative thereto-about a vertical axis is a horizontal turntable 4 having mounted thereon a frame 5, which constitutes the main supporting frame for the kerf cutting mechanism. Mounted on the forward end of the frame 5 and overhanging the truckframe is the improved adjustable supporting structure, generally designated 6, for the kerf cutting mechanism 1, this structure comprising aV single rigid swingable arm 8, a tiltable support 9,r a swingable support I 0, and a rotatable cutter carrying head II. The arm 8 is swingable vertically relative to the truck frame about a transverse horizontal axis at I2, adjacent vthe forward edge of the turntable, while the support 9 is swingable vertically relativeA to the arm abouty `a horizontal axis I3 parallel with the arm pivotv axis I2. The support I0 is mounted on the tiltable support 9 for swinging movement about a vertical axis I4 lying in a longitudinal vertical. plane perpendicular tothe pivotal axes I2 and I3, while the cutter carrying head II is rotatably mounted on the swingable support I0 about a longitudinal axis at right angles to the support pivot axis I4. Pivotally mounted on the cutter head for swinging movement relative thereto about an axis at right angles to the head rotation axis, is an elongated plane cutter bar I5 having mounted on its margin, for circulation thereabout, a cutter bit carrying' cutterV chain I6. Suitable motor operated devices are provided for rotating the turntable 4, for operating the adjustable supporting structure 6, for operating the cutting; mechanism l, and for driving the truck wheels to propel the apparatus along the mine trackway both during cutting and during transport, as will hereinafter be described.

Referring to the turntable mounting structure for the kerf cutting mechanism 1, it will be noted that secured to the truck frame above the truck wheel axes is an annular turntable receiving frame Il on which the circular turntable frame I8 is rotatably mounted, the frame II having an upstanding annular flange I9 and the frame I8 having a depending annular flange 20, the frame I8 supporting a bearing sleeve 2l with which the flange 2] cooperates. Also formed on the frame il is an inner annular ange 22 supporting a bearing sleeve 23 with which an inner depending annular flange 24 rotatably engages. The mechanism for rotating the turntable: 4 at a relatively low speed suitable for cutting and at a relatively high cutter positioning speed, herein comprises a motor 25v mounted on the truck frame at the rear of the turntable structure and having its power shaft connected by a coupling 26 to a shaft 2l suitably journaled within a housing 28 mounted on the rearward portion of the truck frame. Fixed to the shaft 2 is a worm 29 meshing with a worm wheel 30 keyed to a sleeve 3l rotatively mounted on a transverse operating shaft 32, likewise suitably journaled within the housing 28 and within an upstanding bearing bracket 33 formed integral with the adjacent side of the truck frame. The sleeve 3| is adapted to drive, through a plural speed, frictionally controlled, planetary transmissionmechanism generally designated 34, the shaft 32. This transmission mechanism comprises a rotatable casing' 35 frictionally controlled by a brake band 36 regulated by a hand wheel 31. A sliding clutch element 3S controlled by a clutch shipper member 39 is employed for attaining a relatively high and a relatively low speed, this clutch member being alternatively engageable with the high and low speed terminal members 49 and 4I respective- Y lyof the transmission mechanism. As the speciel structure of this planetary transmission mechanism is well known to those skilled in the ihiningart, further illustration and description thereof are considered unnecessary. Splined tothe transverse shaft 32 is a jaw clutch member 42 havingan operating lever 43, and this clutch member is shiftable to connect a bevel gear 44 to the shaft 32. This bevel gear meshes with and drives a bevel gear 45 fixed to a vertical shaft 46, and this shaft in turn has xed thereto a chain sprocket 4l connected by an endless chain 48 to a sprocket 49 keyed to a vertical shaft 50. The shafts 46 and 59 are suitably journaled within the truck frame, and the shaft U has keyed thereto and drives a spur gear 5I meshing with a large spur gear 52, herein formed integral with the. depending ange 20 of the turntable 4 (see Fig. 4). It will thus be seen that when the bevel gear 44 is connected to the shaft 32 and the ,clutch member 39 is operated in an appropriate manner, the turntable 4 may be rotated at either a relatively high or a relatively low speed under friction control of the brake band 36 of the planetary transmission 34. The motor 25 is herein preferably of the reversible electric type, and it is accordingly evident that the turntable may be rotated in either of opposite directions at either a high speed or a low speed, depending upon the direction of motor rotation. When the turntable 4 lis disconnected from its rotating mechanism, itmaybe locked against rotation by means of a sliding locking element 53 (see Fig. l) guided in a bracket 54 secured to the turntable supporting frame and engageable with the teeth of the gear 52 formed on the rotatable turntable frame.

The motor 25 and the planetary transmission mechanism 34 also constitute driving means for the truck wheels to propel the apparatus along the mine trackway at either a relatively high transport speed or at a relatively low cutting speed. This truck wheel driving mechanism comprises a chain sprocket 55 journaled on the shaft 32 and connectible thereto by the jaw clutch member 42, and this sprocket is connected by an endless chain 56 to a chain sprocket 5l fixedY to the rear truck wheel axle. 'I'he front and rear truck wheel axles are connected in driving relation by a chain and sprocket connection 58. A truck wheel brake is provided and comprises a brake drum 59 keyed to the rear truck wheel axle and with which cooperates a usual brake band 6U controllable through connections 6I operated by a brake lever 62. From the foregoing`it is evident that the truck wheels may be driienat either a high or a low speed under the control of the planetary transmission mechanism 34, and through the drive of the reversible motor in either of opposite directions at either speed whenever the clutch member 42 is operated to connect the truck driving member 55 to the shaft 32, and the truck wheel driving speeds may both be frictionally controlled by the brake band 36. When the clutch member 42 is in the position shown in Fig. l, i. e. its neutral position, both the turntable rotation and the truck wheel drive are disconnected from the motor 25.

Now referring to the kerf cutting mechanism, and more particularly to the improved adjustable supporting structure therefor, it will be observed that housed in the turntable frame 5 is a horizontal motor 53, herein preferably of the reversible electric type having the forward end of its power shaft 54 operatively connected to the devices for operating and adjusting the kerf cutting mechanism. In the present construction there are formed integral with the forward portion of the turntable frame 5, parallel forwardly projecting vertical frame portions E5, 65, and journaled within these frame portions is a horizontal hinge shaft 66 extending transversely of the arm 8. The supporting arm 8 has formed on its rear extremity parallel vertical frame portions El, 61 overlapping the frame portions 65. 65 and pivotally mounted on the hinge shaft G6. The outer extremity of the arm 8 has formed thereon parallel vertical frame portions B8, 68, and supported Within these frame portions is a transverse hinge shaft 69 arranged with its axis parallel with the hinge shaft 66. Pivotally mounted on the hinge shaft 69 and overlapping the frame portions 6B, 68 (see Fig. '7) are parallel vertical frame portions l0, lll formed on the tiltable support 9. As shown most clearly in Fig. 6, formed on the tiltable support 9 are parallel, vertically spaced frame portions 1I, 'II having supported therein a vertical hinge shaft 'I2 on which there are rotatably mounted parallel frame portions 13, 'i3 overlapping the frame portions 1I, 'II and formed on the swingable support I5 on which the cutter carrying head II is rotatably mounted. The arm 8, the tiltable support 9, and the swingable support i9 are independently swingable about their respective pivotal axes, and the cutter head Il is rotatable relative ,to the support ID through improved devices which will ,now be described.

As shown in Figs. 3 and 4, connectible to the forward end ofthe motor power shaft 84, as by an operator-controllable multiple disc clutch 14, is a worm 15 meshing with worm wheels 16 and 11 and simultaneously driving the latter in the same direction. These worm wheels are fixed to parallel vertical shafts i8 and 19 respectively, suitably journaled within the turntable frame 5. Keyed to the upper ends of these shafts are spur gears 8|, 8|, and these gears mesh respectively with spur gears 82, 82 xed to parallel vertical shafts 83 and 84, the latter likewise being suitably journaled within the turntable frame 5. Keyed to the shafts 83 and 84 respectively are worms 85 and 86 meshing with worm gear teeth 81 formed on the parallel frame portions S1, 01 of the arm 8. It will thus be seen that when the worm 15 is connected to the motor power shaft by the disc clutch 14, the worms 85, 80 meshing with the worm gear teeth 81 on the arm 8 may be driven to swing the arm either upwardly or downwardly, depending upon the direction of motor rotation. If desired, however, a suitable reversing mechanism may be provided in the drive so that the arm 8 may be swung either upwardly or downwardly without reversal of the motor. Keyed to the forward end of the motor power shaft 64 is a bevel gear 90 meshing with a bevel gear 9| journaled on the hinge shaft 66 and in turn meshing with a bevel gear 92 fixed to the rear end of a shaft'93 suitably journaled within and extending longitudinally of the arm 8 (see also Figs. 6 and '1). Fixed to the forward end of the shaft 93 is a bevel gear 94 meshing with a bevel gear 95 journaled on the hinge shaft 69. The devices for tiltingA the support 9 about the axis i3 relative to the arm 8 herein comprise a hollow shaft 96 journaled on the hinge shaft 89 and driven by the bevel gear 95. Fixed to the shaft 96 is a spur gear 91 meshing with an intermediate gear 98 journaled on a shaft 99 suitably supported within the parallel frame portions 68, 68. The gear 98 in turn meshes with a spur gear |00, likewise journaled within the frame portions B8, 68. The gear is journaled on a transverse shaft |0l, in, turn suitably journaled within the arm 8 (see also Fig. 8) and is connectible to this shaft to drive the latter by an operator-controllable clutch i532. Fixed to the opposite ends of the shaft lill are worms |03, |03 meshing with worm wheels llll, |04. These worm wheels are fixed to vertical shafts |05, suitably journaled within the arm 8 and having fixed thereto worms |08, |00 meshing with worm gear teeth 01 formed on the parallel frame portions 10, integral with the tiltable support 9, as shown in Fig. '7. It will thus be evident that when the clutch |82 is connected the support 9 may be tilted about its pivotal axis relative to the arm 8 in either direction, depending upon the direction of motor rotation. It will be evident, however, that if desired a suitable revers-e mechanism may be provided to enable tilting of the support 9 in either direction relative to the arm without reversal of the motor.

The devices for swinging the support l0 hori-A zontally about its axis i4 relative to the tiltable support 9, comprise a b-evel gear |08 keyed to and driven by the hinge shaft 69 and meshing, as shown most clearly in Fig. 9, with reverse bevels |09 and H8 journaled on a shaft Hl, in turn suitably journaled within a housing ||2 secured to the tiltable support 9. The reverse bevels |09, l0 are selectively connectible to the shaft l`|| by an operator-controllable jaw clutch H3 splined to the shaft. Keyed tothe shaft and driven thereby is a worm ||4 meshing with.

a wormv wheel H5 (see also Fig. 10). in turn keyed to a shaft IIB herein arranged vparallel with the hinge shaft 89 and suitably journaled within the tiltable support'S. Keyed to the shaft H6 and driven thereby is a worm with the teeth of a worm gear" segment ||8 formedon the upper frame portion 13 of the swingable supportlll. It will thus be seen that when one or the other of the reverse bevels |09, H0 is connected to the shaft I, the support I0 may be swung horizontally relative to the support 9 in either direction. It that the worm gearings forswinging the arm, fortilting the support 9 and for swinging the support l0, are herein of the self-locking type and lock automatically theelements adjusted thereby when disconnected from their respective driving means. It will further be noted thatv the gearings for swinging the arm 8 and for tilting the support so proportioned that when the arm is swung in one direction the support 9 is tilted in the opposite direction at suchspeed as to maintain the head axis at all times in a substantially hori- Zontal plane, and that the slow Speed turntable rotation may be also so kproportioned with the swinging speed of the support I0 that when the cutter bar is in a vertical cutting position it may be swung horizontally about the support axis 4 while the kerf cutter at all times remains substantially parallel to a vertical plane.

Now referring to the mechanism for circulating the cutter chain about the margin of the cutter bar, it will .be observed that meshing with ythe bevel gear 95 is abevel gear |20 (see Figs. 6 and 7) fixed to a longitudinal shaft 2|, herein arranged with its axis at right angles to the hinge shaft 69 and lying in a longitudinal vertical plane-including the axes of the shafts 64 and 9,3 and extending radially with respect to the turntable axis. vThe shaft |2| is suitably journaled within the tiltable support 9 and has fixed thereto and drives a bevel gear |22 meshing with a bevel gear |23 journaled on the hinge shaft 12 and in lturn meshing with `a bevel gear |24 fixed to the rear end of a longitudinal shaft |25. The shaft |25 is journaled at its rear end within the swingable support l0 and at its forward end within the frame |26 of the rotatable cutter head andV is arranged with its axis 'alined with the head rotation axis and at right angles to the axis of the hinge shaft 12. Fixed to the forward end yof theshaft |25 is a bevel gear |21 meshing with a large bevel gear |28 journaled on a `shaft |29 herein arranged with its axis coincident with the axis of swinging movement of the cutter bar l5. The bevel gear |28 is connectible, by an operator-1 controllable sliding clutch |30 of a usual design, to the shaft |29; and keyed to the outer end of this shaft and driven thereby is a chain sprocket 43| which engages and drives the cutter chain I9. The cutter bar l5 is attached to a cylindrical supporting frame |32 secured, as by screws |33, to an annular bearing support |34 rotatably mounted in a bore |35 formed in the cutter head frame |25. A thrust ring |31 attached by screws |38 to the cutter head frame serves to retain the annular bearing support |38 within its bore.

The cutter head l lis rotatably mounted on the horizontally swingable support |0, and the mounting for the cutter head comprises an annular bearing support l1 meshing will also be notedy 9 relative to the arm may be |40 secured, as by screws. MI; to,

the circular frame portion |42 of the swingable support I0. Rotatably mounted on this bearing support is a bearing sleeve |43 secured by screws |44 to the cutter head frame |26 and having an inwardly directed flange |45 engaging the bearing support for retaining the sleeve in position thereon. The mechanism for rotating the cutter head about its axis relative to the support I and for swinging the cutter bar about its pivot, comprises a bevel gear |48 fixed to and driven by the bevel gear |28 and meshing with reverse bevels |49, |59 journaled on a shaft I5I extending transversely of the cutter head frame and at right angles to the shaft |29, and suitably journaled within the cutter head frame. The reverse bevels |49, |59 are selectively connectible to the shaft by disc clutches |52, |53 having suitable operating means |54. Connectible to the shaft |54 by an operator-controllable sliding clutch |55 is a worm |56 meshing with a worm wheel |51 keyed to a longitudinal shaft |58, herein arranged parallel with the shaft |25 and suitably journaled within the cutter head frame. Keyed to the rear end of the shaft |58 is a spur gear |59 meshing with the teeth of an internal gear |60 formed on the annular bearing support |46. It will thus be seen that when the clutch |55 is connected and one or the other of the reverse bevel clutches |52, |53 is applied, the cutter head may be rotated about the head axis in either of opposite directions to move the cutter bar completely about the head axis into different cutting positions. Connectible to the shaft |5I by a sliding clutch |6I is a worm |62 meshing with a worm gear |63 fixed to a shaft |64, herein arranged parallel with the shaft |29 and suitably journaled within the cutter head frame. Fixed to and driven by the shaft |54 is a spur gear |65 meshing with the teeth of an internal gear |65 formed on the annular bearing support |34 for the cutter bar. It will thus be seen that when the clutch I6I is connected and one or the other of the reverse bevel clutches |52, |53 is applied, the cutter bar may be swung about its pivot in either of opposite directions. The worm gearings for rotating the cutter head and swinging the cutter bar have self-locking teeth, and when disconnected from their drive lock automatically the parts in their adjusted position.

It will be evident that the swivel support for the cutter bar on the cutter head and the mechanism for swinging the cutter bar l5 about its pivot relative to the cutter head may be omitted and the cutter bar mounted in rigid relation with the cutter head frame. With this rigid cutter bar mounting, the cutter bar may be swung in its plane during the cutting operation about the vertical axis I4 by the mechanism for swinging the support I0 relative to the tiltable support 9. With this bar swinging mechanism omitted, the cutter bar may be swung in a vertical plane during the shearing operation by swinging the arm 9 to move the cutter bar about the arm axis I2 as a pivot and by independently swinging the tiltable support 9 relative to the arm 5.

The mode of operation oi the improved mining apparatus is as follows: The apparatus is propelled along the mine trackway at a relatively high transport speed through the planetary transmission 34 driven by the motor 25, it being understood that at that time the cutter bar is in the full-line position shown in Figs. 1 and 2. When the working face is reached, the high speed truck wheel drive is disconnected from the motor by releasing the friction band 36 and sliding the clutch member 38 into its neutral position. If it is desired to make a horizontal cut at or near the level of the mine floor in front of the end of the trackway in accordance with the arcwall method, the clutches controlling the swinging mechanisms for the arm and tiltable support 9 are applied, and upon running of the motor 63 in the proper direction, the parts are swung into the lower dotted-line position shown in Fig. 2, the support 9 swinging upwardly about its pivot I3 as the arm 8 is swung downwardly about its pivot I2, thereby to move the cutter bar I5 into the horizontal floor cutting position shown. The bar swinging mechanism is then operated and the cutter bar I5 is swung laterally from left to right until its tip end is located adjacent the right-hand rib of the entry, the bar swinging controlling clutches thereafter being released. The operator then operates the sliding clutch |30, connecting the cutter chain I6 toits drive. With the parts thus disposed, the planetary transmission mechanism 34 is operated, and upon connection of the clutch 42 the truck wheels are driven to propel the apparatus bodily along the mine trackway at a low cutting speed to effect sumping of the cutter bar beneath the coal. After the completion of the sumping cut, the truck wheel drive is disconnected and the brake 59, 60 applied, holding the truck wheels against movement, and the bar swinging mechanism is then operated to effect swinging movement of the cutter bar I5 about its pivot from its position adjacent the right-hand rib transversely across the coal face, to a position wherein its tip end is l0- cated adjacent the left-hand rib, the bar swing controlling clutch thereafter being released. After the completion of the swinging cut, the motor 25 is reversed, and upon connection of the jaw clutch 42, the apparatus is propelled rearwardly along the mine trackway at a slow cutting speed to effect withdrawal of the cutter bar from beneath the coal face. The cutter bar and its adjustable supporting structure are then returned to the full-line position indicated in Figs. l and 2, and upon connection of the fast speed drive of the planetary transmission, the apparatus is propelled bodily rearwardly along the trackway at a high transport speed to another working place.

If it is desired to cut a horizontal kerf at or near the level of the mine floor outside and below the level of the mine trackway in accordance with the arcwall method, the operator releases the turntable lock 53 and shifts the clutch member 38 of the planetary transmission into its high speed position, and then operates the clutch 42 to connect ,the gear 44 to the shaft 32, thereby causing the turntable 4, together with the cutting mechanism supported thereby, to be swung horizontally relative to the truck at a relatively high cutter positioning speed from the central fullline position shown in Fig. 1 to a position Wherein the cutter bar pivot lies outside of the trackway. During horizontal swinging movement of the turntable relative to the truck, the cutter bar may be swung simultaneously about its pivot in the opposite direction until the tip end of the cutter bar assumes a position adjacent the righthand rib at a less angle with respect to the rib than the angle of the pivoted arm structure. When the parts are thus disposed, with the bar pivot lying outside the trackway, the operator connects the swinging mechanisms for swinging the arm and support 9 to their drives, and the arm is swung downwardly about its pivot while the support 9 is simultaneously swung upwardly until the parts assume the lower dotted-line posi- -tion shown in Fig. 2, with the cutter bar at the floor level outside the mine trackway. When the parts are thus disposed, the turntable is locked against rotation, and thereafter the truck wheels are driven from the motor 25 from the planetary transmission to propel the apparatus bodily along the mine trackway at a low cutting speed to effect sumping of the cutter bar beneath the coal face. The brake 59, is then set to hold the truck wheels stationary, the turntable lock released and the turntable rotation mechanism is operated to eiect rotation of the turnable at a relatively low speed to eiiect swinging of the adjustable supporting structure for the cutter bar laterally from right to left. Upon initial swinging movement of the arm structure, the cutter bar I5 is swung about its pivot in the opposite direction until the parts assume a straightline position wherein the cutter bar lies in a vertical plane passing through the axes of the cutter bar pivot, the swingable support Illand the turntable. After the cutter bar has been straightened up, turntable rotation is continued, thereby swinging the cutter bar about the turntable axis from the right-hand rib until the tipV end of the cutter bar lies adjacent the left-hand rib. After the tip end of the cutter bar has reached the lefthand rib, the cutter bar is again swung about its pivot in a direction opposite from the direction of turntable rotation, while rotation of the turntable is continued; the turntable and cutter bar swinging simultaneously in opposite directions at that time until they assume an angular postion with the cutter bar disposed at a less angle with respect to the left-hand rib than the angle of the adjustable arm structure relative thereto. The turntable rotation and bar swing mechanisms are then disconnected from their drives and the turntable lock connected, the brake released, and thereafter the apparatus is propelled bodily rearwardly along the mine trackway at a low speed to eiect withdrawal of the cutter bar from beneath the coal. After the completionv of the bottom cut beneath the coal, the parts are again returned to their transport position, as indicated in full lines in Figs. l and 2, and the apparatus transported to another working place.

A horizontal kerf may be cut at or near the level of the mine roof by applying one or the other of the friction clutches |52, 53 of the head rotating mechanism to eiect rotation of the cutter head H about its axis from the fullline position shown in Fig. 2 to a position wherein the cutter bar overlies the bar support, the cutter bar moving through an arc of a circle from its lower position to its upper position. When the parts are thus disposed, the clutches controlling the mechanisms for swinging the arm and tiltable support 9 about their respective pivots are operated to effect swinging movement of the arm upwardly to the upper dotted-line position shown in Fig. 2, the support 9 swinging downwardly as the arm swings upwardly until the parts assume the top cutting position shown, with the cutter bar at the roof level. The cutter bar is then sumped in, swung transversely in its plane and withdrawn from the coal face, in accordance with the usual arcwall method of cutting.

It will be noted that during any of the horizontal cutting operations above described, for

instance, when it is desired to cut a rolling or uneven floor or a pitching coal seam, the cutter bar may be tilted about transverse and longitudinal axes, i. e. about the axes of the cutter head and the tiltable support 9, to change its angle in altitude. For instance, if it is desired to tilt the tip end of the cutter bar upwardly or downwardly, this may be accomplished simply by swinging the swingable support 9 upwardly and downwardly about its pivotal axis, while if it is desired to tilt the cutter bar edgewise, the cutter head is rotated about its axis. A shear or vertical cut may be inserted in the coal face by applying one or the other ofthe reverse frictions i552, |53 Aof the head rotating mechanism, thereby rotating the head Il about its axis to bring the cutterA bar into a position to swing vertically. During the shearing operation, the cutter bar is rst sumped in, then swung downwardly in its plane and `thereafter with'- drawn from the coal face in a manner similar to that described above in connection with horizontal cutting in accordance with the usual arcwall method. It will further ber noted that by rotating the'turntable and simultaneously swinging the support labout its axis i4, the v.cutter bar may be positioned to `out Avertical kerfs at any desired location between the center of the'entry and either rib, one shearing position being indi; cated in dotted lines in Fig.l 1. When the parts are in the dotted-line'position shown in Fig. 1, the arm 8 may be kswung upwardly to position the cutter bar at the roof, and the apparatus izo may then bev propelled bodily alo-ng the trackway to eiect sumping of theA cutter bar within the coal face. After the completion of the sumping cut, the arm may be swung downwardly to move the cutter bar in the arcuate path about the arm pivot axis 'as a pivot to cut an upright, r slightly curved kerf in the coal face from a point adjacent the mine roof to a point at the mine floor. rIhereafter, the cutter bar may be moved rearwardly to eiect its withdrawal cut by propulsion of theapparatus bodily rearwardly along :Y the trackway. By swinging the cutter head suplar upright, slightly curved kerf may be cut l in the rib. By swinging the arm tothe opposite side of the apparatus, a vsimilar cut may be inserted in the opposite rib. It will further be noted that by rotating the head l I the cutter bar may be moved through an arc of a circle to shearing positions at either side of the cutter head axis, this being necessary when vertical kerfs are cut at opposite ribs.

As a result of this invention, it will be noted that an improved coal mining apparatus is provided, having an improved adjustable supporting structure for the kerf cutter, whereby horizontal kerfs may be out at or near the level of the mine oor, either in front of or outside and below the level of the mine trackway, horizontal cuts at any desired location between the mine roof and mine floor, and vertical cuts at any desired location between the ribs ofthe entry. it will :further be noted that by the provision of the improved adjustable supportingA structure, vertical kerfs may be cut in either rib of the entry, and that the apparatus maybe operated to make shear or vertical cuts when the apparatus is supported and guided by a curved or uneven trackway. It will further be noted that by the provision of the improved'adjustable supporting structure for the kerf cutter, the latter may not only be positioned at any desired location between the mine roof and mine floor and the ribs of the entry, but also may be tilted about longitudinal and transverse axes to change its angle in altitude, thereby to accommodate itself to a rolling or uneven floor or pitching coal seam. It will still further be evident that an improved coal mining apparatus is provided, wherein the adjusting mechanism for the kerf cutter is extremely flexible and has a` wide range of adjustment, it being possible to operate the apparatus as a bottom cutter, top cutter, center cutter, shear cutter and slabbing machine, thereby enabling the apparatus to accommodate itself to practically every mining condition encountered. These and other uses and advantages will be apparent to those skilled in the art.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form is shown for illustrative purposes and that theinvention may be modied and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer end of said arm to swing relative thereto about a vertical axis while said arm remains stationary, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support axis, and a kerf cutter carried by said cutter head and positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation.

2. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer end of said arm to swing relative thereto about a vertical axis while said arm remains stationary, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support axis, and a kerf cutter carried by said cutter head and adjustable with said head about the head axis into positions for cutting horizontal and vertical kerfs respectively.

3. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto and at its outer extremity overhanging said base, a support mounted at the outer overhanging extremity of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support axis, and a kerf cutter carried by said cutter head and positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation.

4. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto and at its outer extremity overhanging said base, a support mounted at the outer overhanging extremity of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support axis, and a kerf cutter carried by said cutter head and adjustable with said head about the head axis into positions for cutting horizontal and Vertical kerfs respectively.

5. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto and at its outer extremity overhanging said base, a support mounted at the outer overhanging extremity of said arm to swing relative Athereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation, and a motor mounted on said turntable and relative to which said arm is swingable for swinging said arm.

6. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto and at its outer extremity overhanging said base, a support mounted at the outer overhanging extremity of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and positionable for cutting in diierent planes by rotation of said head upon its said horizontal axis of rotation, and a motor mounted on said turntable and relative to which said arm is swingable for swinging said arm and for swinging said support relative to said arm.

'7. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto and at its outer extremity overhanging said base, a support mounted at the outer overhanging extremity of Said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and a motor mounted on said turntable and relative to which said arm is swingable for swinging said arm, for swinging said support relative to said arm, and for rotating said cutter head relative to said swingable support to change the plane of cutting.

8. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to` swing relative thereto about an axis parallel with the arm swing axis, a support mounted on said iirst support to swing horizontally relative thereto about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, and a kerf cutter carried by said cutter head.

9. In a mining apparatus, a portable base, a horizontal turntableon said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a support mounted on said first support to swing horizontally relative thereto about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, and a kerf cutter carried by said cutter head and adjustable with said head about the head axis into positions for cutting horizontal and vertical kerfs respectively.

10. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a support mounted on said first support to swing horizontally relative thereto -about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and a motor relative to which said arm is swingable for swinging said arm.

1l. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a support. mounted on said first support to swing horizontally relative thereto about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and a motor relative to which said arm is swingable for swinging said arm and for swinging said rst support relative to said arm.

12. In a mining apparatus, a portable base, a

horizontal turntable on said base, an arm pivotf ally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a support mounted on said rst support to swing horizontally relative thereto about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and a motor relative to which said arm is swingable for swinging said arm, for swinging said rst support relative to said arm and for swinging said second support relative to said first support.

13. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a tiltable support mounted at the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a support mounted on said first support to swing horizontally relative thereto about a vertical axis, a cutter carrying head mounted on said last named support for rotation relative thereto about a horizontal axis, a kerf cutter carried by said cutter head, and a motor relative to which said arm is swingable for swinging said arm, for swinging said rst support relative to said arm and for swinging said second support relative to said rst support, and for rotating said cutter head relative to said second support.

14. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing vertically relative thereto, a tiltable support pivot- `ally mounted on the outer end of said arm to swing relative thereto, about an axis parallel axis.

15. In a. mining apparatus, a portable base, an arm pivotally mounted on said base to swing vertically relative thereto, a tiltable support pivotally mounted on the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a second support swingably mounted on said tiltable support to swing relative thereto about a vertical axis, and a cutter head mounted on said last named support for rotation relative thereto about a horizontal axis arranged at right angles to the arm swing axis and the axis of swing oi said rst support.

16. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing vertically relative thereto about a horizontal axis extending transversely of said base, ya tiltable support pivotally mounted on the outer endo-f said arm to swing relative thereto about an axis parallel with the arm swing axis, a second support swingably mounted on said tiltable 4support to swing relative thereto abo-ut a vertical axis,r

and a cutter head mounted on said last named support for rotation relative theretov about a horizontal axis.

17. In a mining apparatus, a portable base, a frame mounted on said base to swing horizontally relative thereto, an arm pivotally mounted on said frame to swing vertically relative thereto, a tiltable support pivotally mounted at the outer end of said arm, a second support pivotally mounted on said tiltable support to swing relative thereto about a vertical axis, a vertical-hert cutter mounted on said last named support,` and means `for ad justirig said kerf cutter, while said vertical axis remains vertical, relative to said tiltable support selectively into mutually parallel, vertical-kerf cutting positions at opposite sides of a vertical plane including the vertical axis of said second support.

18. In a mining apparatus, a portable base, a frame mounted on said base to 'swing horizontally relative thereto, an arm pivotally mounted on said frame to swing vertically relative thereto, a tiltable support pivotally mounted at the outer end of said arm, a second supportpivotally mounted on said tiltable support to swing relative thereto about a vertical axis, a vertical-kerf cutter mounted on said last named support, means for adjusting said kerf cutter relative to said tiltable support, while said vertical axis remains vertical, selectively into mutually parallel, vertical-kerf cutting positions at opposite sides of a vertical plane including the vertical axis of lsaid second support, said arm being swingable to move the kerf cutter in an upright slightly curved path about the arm swing axis as a pivot in substantially any vertical-kerl?l cutting position of said' bar.

19. In a mining apparatus, a portable base, a

on said tiltable support to swing relative thereto about a vertical axis, a vertical-kerf cutter mounted on said last named support, means for adjusting said kerf cutter relative to said tiltable support, while said vertical axis remains vertical, selectively into mutually parallel, vertical-kerf cutting positions at opposite sides of a vertical plane including the vertical axis of said second support, said arm being swingable in one direction relative to said base and said last named support swingable in the opposite direction relative to said arm to move the kerf cutter into diiferent parallel vertical kerf cutting positions in either adjusted position of said keri cutter.

20. In a mining apparatus, a portable base, a frame mounted on said base to swing horizontally relative thereto, an arm pivotally mounted on said base to swing vertically relative thereto, a tiltable support pivotally mounted on the outer end of said arm to swing relative thereto about an axis parallel with the arm swing axis, a second support pivotally mounted on said tiltable support to swing relative thereto about a vertical axis, a cutter head mounted on said last named support for rotation relative thereto about a horizontal axis, and a kerf cutter carried by said cutter head.

21. In a mining apparatus, a portable base, a support mounted on said base to turn about a vertical axis, an arm pivotally mounted on said support to swing in a vertical direction relative thereto, a frame mounted on said arm for tilting adjustment with respect thereto about rectangularly related axes, a cutter head rotatably mounted on said tiltable frame, and a kerf cutter carried by said cutter head and rotatable therewith with respect to said tiltable frame into positions for cutting horizontal and vertical kerfs respectively.

22. In a mining apparatus, a portable base, a support mounted on said base ior swinging adjustment in a vertical direction with respect thereto about a horizontal axis, a frame carried by said swinging support for tilting adjustment with respect thereto about rectangularly related axes, a cutter head rotatably mounted on said tiltable frame, and a kerf cutter carried by said cutter head and rotatable therewith about the head axis into positions for cutting horizontal and vertical kerfs respectively.

23. In a mining apparatus, a portable base, an arm structure pivotally mounted on said base to swing in a vertical direction with respect thereto, a frame carried by said arm structure for tilting adjustment with respect thereto about rectangularly related axes, a cutter head rotatably mounted on said tiltable frame, and a kerf cutter carried by said cutter head and rotatable therewith about the head axis into positions for cutting horizontal and vertical kerfs respectively.

24. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing in a vertical direction with respect thereto, a support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said rst support to swing relative thereto about an axis at right angles to said pivotal axis of said rst support, a cutter support pivotally mounted on said second support to swing relative thereto about an axis lying in a plane parallel to a p-lane including the axis of swing of said second support, and a horizontal-kerf cutter carried by said cutter support.

25. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing in a vertical direction with respect thereto, a support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said rst support to swing relative thereto about an axis at right angles to said pivotal axis of said first support, a third support rotatably mounted on said second support to turn about an axis at right angles to the pivot axis of said second support, a cutter support pivotally mounted on said third support to swing relative thereto about an axis lying in a plane parallel to a plane including the pivot axis of said second support, and a kerf cutter carried by said cutter support.

26. In a mining apparatus, a portable base, a horizontal turntable mounted on said base, an arm pivotally mounted on said turntable to swing in a vertical direction with respect thereto, a support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said rst support to swing relative thereto about an axis at right angles to said pivotal axis of said first support, a cutter support pivotally mounted on said second support to swing relative thereto about an axis lying in a plane parallel to a plane including the pivot axis of said second support, and a horizontal kerf cutter carried by said cutter support.

27. In a mining apparatus, a portable base, a horizontal turntable mounted on said base, an arm pivotally mounted on said turntable to swing in a vertical direction with respect thereto, a support pivotally mounted on the outer extremity of said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles to said. pivotal axis of said first support, a third support rotatably mounted on said second support about an axis at right angles to the pivot axis of said second support, a cutter support pivotally mounted on said third support to swing relative thereto about an axis lying in a plane parallel to a plane including the pivot am's of said second support, and a kerf cutter carried by said cutter support.

28. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said first support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of said first and second supports, and a kerf cutter carried by said third support and positionable b-y rotation of said third support on its respective axis of rotation for cutting in diierent planes.

29. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said rst support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said first support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said rst and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said third support, and a kerf cutter carried by said fourth-support.

30, In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second sup'- port pivotally mounted on said rst support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said first support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said first and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said thirdsupport and lying in a plane parallel to a plane including the axis of said second support, anda kerf cutter carried by said fourth support.

31. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said irst support, a third support mounted on, said second support to rotate relative thereto about an axis at right angles to the axes of swing of saidrst and second supports, a kerf Icutter carried by said third support and positionable by rotation of said third support on its respective axis of rotation for cutting in diiierent planes, and a motor relative to which said supports are adjustable for actuating said kerf cutter.

'32. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said first support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said rst and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said third support, a kerf cutter carried by said fourth support, and a motor relative to which said supports are adjustable for actuating said kerf cutter.v

33. In a mining apparatus, a portable base, an arm pivotally mounted on said -base to swing relative thereto', a support pivotally mounted on said arm to swing relative thereto aboutan axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said rst support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said first and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said third support and lying in a plane parallel to a plane including the axis of said second support, a kerf cutter carried by $551@ LQQFh SllDpOl't, and a motor relative to said kerf cutter. v

34. In a mining apparatus, a'portable base.'

an arm pivotally mounted on said base to swing relative thereto, a support pivotallymounted on' said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second sup,- pcrt pivotally mounted on said first support to swing relative thereto about vanA axis at right angles'with respect to the pivotal axis of said first support, a third support mounted on said second support to rotate relative thereto about an axis at right anglesl to the axes of swing of said iirst and second supports, a kerf cutter carried by said third support andpositionable by rotation of said third support on its respective axis of rotation forr cutting in different planes, anda motor relative to which said supports are ad-l justable for actuating said kerf cutter and for eiiecting tilting movement of said supports with respect to said arm.

35. In a mining apparatus, a portable base,. an arm pivotally mounted `on saidbase to swing relative'the'reto, a support pivotally mounted on saidarm to swing relative'thereto about an axisl parallel with the arm `pivot axis, a second support pivotally mounted on` saidrst `support to swing relative thereto about an axis at `right angles with respect to the pivotal axis of said iirst support, a third support'mounted on said second .support to rotate relative thereto about an axis at right angles to the axes ofswing of said first and second supports, a' fourth support pivotally mounted on said third support to' rotate relative thereto about an axis at right angles to theaxis of rotation of said third-support, aV kerf cutter carried by said fourth support, and a-motor relative to which said supports are adjustable for actuating said kerf vcutter and for effecting tilting movement-of said -supports with respect to said armj. l l I 36. In a mining apparatus, a portable base, an arm pivotally mounted on said base to 'swing relative thereto, a supportrpivotally mounted on said arm to swing relativeethereto about an axis parallel with the arm pivot axis, a second support pivotally mounted kon said rst support to swing relative thereto about.an-axis at right angles with respect to. thel pivotal axis of said first support-a third :support mounted on said second support Yto rotate relativethereto about an axis at right angles to the axes of swing of` said first-and second supports, a fourth'support piv otallyl mounted ony said thirdV support to rotate relative thereto about an axis at right angles to the axisof rotation of said third support and lying in a plane'parallel to a plane including the axis of said second support, a kerf cutter carried by said fourth support, and a motor relative to which said supports are adjustable for actuating said kerf cutter-'and for eiiectingA tilting movement of said supports with respect to said arm.

37. In a mining apparatus, a portable base,1an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said rst support, av third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes ofv swing of said iirst and second supports, a kerf cutter carried bysaid third supportand positionable byrota tion of said third support on its respective axis of rotation for cutting in diiferent planes, and a motor relative to which said supports are adjustable for actuating said kerf cutter, for effecting tilting movement of said supports with respect to said arm and for swinging said arm about its pivot.

38. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relative thereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about an axis at right angles with respect to the pivotal axis of said rst support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said first and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said third support, a kerf cutter carried by said fourth support, and a motor relative to which said supports are adjustable for actuating said kerf cutter, for effecting tilting movement of said supports with respect to said arm and for swinging said arm about its pivot.

39. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing relative thereto, a support pivotally mounted on said arm to swing relativethereto about an axis parallel with the arm pivot axis, a second support pivotally mounted on said first support to swing relative thereto about lan axis at right angles with respect to the pivotal axis of said rst support, a third support mounted on said second support to rotate relative thereto about an axis at right angles to the axes of swing of said first and second supports, a fourth support pivotally mounted on said third support to rotate relative thereto about an axis at right angles to the axis of rotation of said third support and lying in a. plane parallel to a plane including the axis of said second support, a kerf cutter carried by said fourth support, and a motor relative to which said supports are adjustable for actuating said kerf cutter, for eiiecting tilting movement of said supports with respect to said arm and for swinging said arm labout its pivot.

40. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm swingably mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer extremity of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support pivot axis, a kerf cutter carried by said cutter head and positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation, and independently operable motor operated devices for rotating said turntable to swing said arm horizontally and for swinging said support relative to said arm while the latter remains stationary as regards swinging movement about its pivotal axis to vary the angular position of the head axis.

4l. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm pivotally mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer ena of said arm to swing horizontally mtg qi;-

ferent angularly related positions with respect' thereto about a vertical axis while said arm remains stationary as regards swinging movement about its pivotal axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support pivot axis, and a kerf cutter carried by said cutter head and positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation.

42. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing in a vertical direction relative thereto, a cutter carrying head rotatable on a horizontal axis and carrying a kerf cutter which is positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation, and a universal pivotal supporting structure intervening said arm and said head for supporting the latter, said head being swingable through said universal pivotal supporting structure in horizontal and vertical directions relative to said arm.

43. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing in horizontal and vertical directions relative thereto, a cutter carrying head rotatable on a horizontal axis and carrying a kerf cutter which is positionable for cutting in different planes by rotation of said head upon its said horizontal axis of rotation, and a universal pivotal supporting structure intervening said arm and said head for supporting the latter, said head being swingable through said universal pivotal supporting structure in horizontal and vertical directions relative to said arm.

44. In a mining apparatus, a portable base, an arm pivotally mounted on said base to swing in a vertical direction relative thereto, a cutter carrying head rotatable on a horizontal axis and carrying a kerf cutter which is positionable for cutting in different planes by rotation of said headv upon its said horizontal axis of rotation, and a pivotal supporting structure intervening said arm and said head for supporting the latter including relatively swingable supporting elements arranged on rectangularly related axes, said cutter head being swingable through said pivotal supporting structure in horizontal and vertical directions relative to said arm.

45. In a mining apparatus, a horizontal turntable, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a support pivotally mounted on the outer extremity of said arm to swing in a vertical direction relative thereto about a horizontal axis, a second support pivotally mounted on said rst support to swing in a horizontal direction relative thereto about a vertical axis, and a kerf cutter pivotally mounted on said second support to swing relative thereto in horizontal planes about an axis lying in a vertical plane parallel to a vertical plane including the pivotal axis of said rst support.

46. In a mining apparatus, a horizontal turntable, an arm pivotally mounted on said turntable to swing in a vertical direction relative thereto, a support pivotally mounted on the outer extremity of said arm to swing in a vertical direction relative thereto about a horizontal axis, a second support pivotally mounted on said iirst support to swing in a horizontal direction relative thereto about a vertical axis, a cutter carrying head rotatably mounted on said second sup- `port to turn on a horizontal axis arranged at right angles to the pivotal axis of said second support, and a kerf cutter carried by said cutter head and adjustable into diierent angularly related cutting planes by rotation of said cutter carrying head upon said horizontal axis.

47. In a mining apparatus, a horizontal turntable, an arm pivotally mounted o-n said turntable to swing in a vertical direction relative thereto, a support pivotally mounted on the outer extremity of said arm to swing in a vertical direction relative thereto about a horizontal axis, a second support pivotally mounted on said first support to swing in a horizontal direction relative theretoabout a vertical axis, a cutter carrying head rotatably mounted on said second support to turn on a horizontal axis arranged at right angles to the pivotal axis of said second support, and a kerf cutter pivotally mounted on said cutter head to swing with respect thereto abo-ut an axis arranged at right angles with respect to said head axis.

48. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer end of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis atright angles to the support axis, said support being swingable horizontally about said vertical axis to move the cutter head axis into diierent angularly related positions with respect to said arm and turntable, and a kerf cutter carried by said cutter head and adjustable into different angularly related cutting planes by rotation of said cutter carrying head upon said horizontal axis.

49. In a mining apparatus, a portable base, a horizontal turntable on said base, an arm mounted on said turntable for movement relative thereto and at its outer extremity overhanging said base, a support mounted at the outer end of said arm to swing relative thereto about a vertical axis, a cutter carrying head mounted on said swingable support for rotation relative thereto about a horizontal axis at right angles to the support axis, said support being swingable horizontally about said vertical axis to move the cutter head axis into different angularly related positions with respect to said arm and turntable, and a kerf cutter carried by said cutter head and adjustable with said head about the head axis into positions for cutting horizontal and vertical kerfs respectively.

CHARLES F. OSGOOD. 

